Table 4 Hazard ratios for breast cancer mortality (coded cause 1a, 1b or 1c mentioning ‘C50’ or ‘174’ or text cause 1a, 1b or 1c mentioning ‘breast’) in breast cancer patients diagnosed 1998–2003

	Adjusted for age				Socioeconomic deprivation				Stage				Treatment
	HR	95%	CI	P	HR	95%	CI	P	HR	95%	CI	P	HR	95%	CI	P
Ethnic group
White	1.00				1.00				1.00				1.00
Indian	1.08	0.89	1.30	0.437	1.02	0.85	1.23	0.809	0.86	0.71	1.03	0.105	0.86	0.71	1.04	0.118
Pakistani	1.19	0.79	1.80	0.400	1.11	0.74	1.67	0.625	0.87	0.58	1.31	0.496	0.87	0.58	1.31	0.501
Bangladeshi	1.25	0.65	2.40	0.507	1.13	0.59	2.18	0.711	0.85	0.44	1.63	0.618	1.00	0.52	1.93	0.990
Black Caribbean	1.31	1.11	1.55	0.001	1.18	1.00	1.39	0.054	1.03	0.87	1.21	0.748	1.01	0.85	1.19	0.953
Black African	1.74	1.42	2.14	<0.001	1.56	1.27	1.91	<0.001	1.27	1.03	1.56	0.025	1.09	0.89	1.34	0.412
Chinese	0.67	0.39	1.13	0.131	0.65	0.39	1.10	0.112	0.62	0.37	1.06	0.079	0.63	0.38	1.07	0.089
Test for heterogeneity: χ² (6 d.f.)	41.6			P<0.0001	23.8			P=0.0006	11.8			P=0.0657	6.5			P=0.3679
Socioeconomic deprivation
1 (most affluent)					1.00				1.00				1.00
2					1.10	1.03	1.17	0.004	1.14	1.07	1.21	<0.001	1.13	1.07	1.21	<0.001
3					1.19	1.12	1.27	<0.001	1.21	1.14	1.29	<0.001	1.21	1.14	1.29	<0.001
4					1.24	1.16	1.32	<0.001	1.26	1.18	1.34	<0.001	1.25	1.17	1.33	<0.001
5 (most deprived)					1.41	1.33	1.51	<0.001	1.26	1.18	1.35	<0.001	1.27	1.19	1.35	<0.001
Test for trend: χ² (1 d.f.)					124.7			P<0.0001	61.6			P<0.0001	62.0			P<0.0001
Treatment
Cancer surgery													0.47	0.45	0.49	<0.001
Radiotherapy													0.85	0.82	0.89	<0.001
Chemotherapy													1.76	1.67	1.85	<0.001
Hormone therapy													0.86	0.83	0.90	<0.001

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